One of the most economical possibilities is to embed a seesaw
mechanism [1]}, [2]}, [3]}
in the framework of SUSY models (i.e. the SUSY seesaw) [4]}. For any seesaw realisation, the
neutrino Yukawa couplings could leave their imprints in the SUSY soft-breaking slepton mass matrices, and
consequently induce flavour violation at low energies due to the renormalisation group (RG)
evolution of the SUSY soft-breaking parameters.
The caveat of these scenarios is that, in
order to have sufficiently large Yukawa couplings (as required to account for large cLFV Brs),
the typical scale of the extra particles
(such as right handed neutrinos, scalar or fermionic isospin triplets) is in general very high, potentially very close to the gauge coupling unification scale.
However, such a high (seesaw) scale would be impossible to probe experimentally.
